Extension step-ladder.



No. 745,320. PATENTED DEC. 1, 1903. H. E. BRUNO.

- EXTENSION STEP LADDER.

APPLICATION IILED'MAY a, 1903.

no MODEL. 2 SHEETS-SHEET 1.

TN: NORRIS PETERS co. Fumapmu. wnsmuomm 0. c.

'NO. 745,s20. E PATENTED DEC. 1, 1903.

I H. E. BRUNO.

EXTENSION STEP LADDER. APPLIOATIOE FILED MAY s 1903.

NVO MODEL.

' 2 SHEETS-SHEET 2.

F3. 2. I F94) UNITED STATES Patented December 1, 1903.

PATENT OFFICE.

EXTENSION STEP-LADDER! SLEEGLFIGATION forming part of Letters Patent No.745,320, dated December 1, 1903.

Application filed May 8,1903. Serial No. 156.220.

all whom it may concern:

Be it known that I, HERMAN E. BRUNO, a citizen of the United States,residing at St. Louis, State of Missouri, have invented a new 5 anduseful Improvement in Extension Step- Ladders, of which the following isa specification, reference being had'to the accompanyingdrawings,forming a part thereof.

My invention has relation to improvements -o in extension step-ladders;and it consists in the novel construction and arrangement of parts, morefully set forth in the specification and pointed outin the claims.

In the drawings, Figure 1 is a side elevation l 5 of the step-ladderextended. Fig. 2 is a similar view showing the same closed. frontelevation of Fig. 1. Fig. 4 is a rear eleation of Fig. 1. Fig. 5 is anenlarged crosssectional detail of the straps carried .by the rearstandards of the ladder, and Fig. 6 is an enlarged cross-sectionaldetail of the casting or shoe carried by the front standards of theladder.

The object of my invention is to construct 2 an extension step-ladderwhich shall berigid when extended, one which is compact, durable, andcheap to manufacture.

In detail the invention may be described as follows.

0 Referring to the drawings, 1 represents the front fixed standards ofthe ladder, and 2 the rear hinged standards, the. upper platform 3 asusual. Adapted to slide along the fixed standards 1 are the for- 5 wardextension members 1, the connection between the two being effected by atongue 5 in the standards 1 engaging a groove 6 on the members 4. Themembers 4 are each provided with a shoulder 7- at its upper end,

which engages the projecting edge of the platform?) whenthe ladder is.closed, this arrangement contributing to the rigidity of the parts, asis obvious. Embracing the hinged standards 2 and the rear extensionmembers 8 are straps 9, each strap being provided with a rearclamping-screw 10, the base of the screw loosely operating in a gripping-block 11, adapted to bear against and grip the surface of the member 8and hold the parts together Fig. 3 is aboth being secured to I (Nomodel.)

when once adjusted to the proper height. The standards 1 and 2 areconnected by the folding links 12 12 as usual.

Secured to the outer lateral faces of the standards 1 1 and spanning theseam formed between said standards and their extension members 4: arecastings or shoes 13, each shoe having the front deflected terminal lips14.,

which embrace the front face of the members 1, Figs. 3, 6. Mounted alongthe upper end of each shoe is a spring-controlled pull-knob 15, the stemof which can be made to engage one of a series of sockets 16, disposedopposite the ends of the several steps of the extension members. Bymeans of the pull-knob 15 and the clamping-screws 10 the ladder may beset to any desirable extension, Fig. 1.

The several standards and their extensions flare outwardly at thebottom, Figs. 3, 4, thereby insuring an expanded supporting-base for theladder. The rear standards and their extensions are reinforced by wirebraces 17 and 18, respectively.

Having described my invention, what I claim is- 1. In an extensionstep-ladder, a suitable terminal platform, forward fixed standards andrear hinged standards for the same,

tongues disposed along the front faces of the fixed standards, extensionmembers having rear grooves for the reception of the tongues, shoescarried by the lateral faces of the fixed standards and spanning theseams formed between them, and the extension members, lips on each shoedeflected to-bear against the front face of each extension member,the'lateral faces of the extension members having a series of sockets,and pull-knobs carried by the shoes and having stems for engaging saidsockets, substantially as set forth.

2. In an extension step-ladder, a suitable terminal platform, forwardfixed standards and rear hinged standards for the same, tongues disposedalong the front faces of the fixed standards, extension members havingrear grooves for the reception of the tongues, an upper terminalshoulder on each extension member adapted to bear against the frontshoes carried by the edge of the platform,

lateral faces of the fixed standards and spanstems for engaging saidsockets, substantially ning the seams formed between them and the as setforth.

extension members, terminal deflected lips A on each shoe bearingagainst the front face HERMAN LR of each extension member, the lateralfaces Witnesses:

of the latter having a series of sockets, and JNO. P. BECKER,

pull-knobs carried by the shoes and having J. RICHARD HAAS.

